GROWTH PERFORMANCE, BRAN OIL CHARACTERISTICS AND HULL VOLATILE CONSTITUENTS OF SOME RICE VARIETIES | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 8, Volume 93, Issue 2, July 2015, Page 481-499 PDF (722.75 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2015.154460 | ||||
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| Authors | ||||
| MOHAMED E. ELSORADY1; TAMER F. METWALLY2; ZENAB A. ABD-ALHAFEZ3 | ||||
| 1Oils and Fats Dept, Food Tech. Res. Inst., ARC, Giza, Egypt. | ||||
| 2Rice Res. Dept., Field Crops Res. Inst., ARC, Kafer El-Sheikh, Egypt. | ||||
| 3Medicinal and Aromatic Plants Res. Dept., Horticulture Res. Inst., ARC, Alexandria, Egypt | ||||
| Abstract | ||||
| this study was undertaken to identify the differences among various aromatic rice genotypes in growth and yield as well as the characterization of bran oil and hull volatile constituents of both Egyptian Jasmine and Giza177 rice varieties under Egyptian condition. Six different rice genotypes namely; Egyptian Jasmine, IR74052-177-3-3, IR74053-144-2-3, Basmati 370 and PR26679-PI 3-1 Giza 177 as a check variety were transplanted at the experimental farm of RRTC during the rice growing seasons 2012 and 2013. Randomize complete block design with four replications was used. The main results revealed that the rice genotypes differed significantly (P<0.05) with respect to agronomic studied characters under study. Egyptian Jasmine surpassed most of the other tested genotypes in these characters, while the check variety Giza177 recorded the lowest values of plant height, duration and number of panicle m-2. Giza177 produced the longest panicle with highest number of its branches and the highest number of filled grains panicle-1 with the lowest sterility % consequently produced the greatest grain yield t ha-1. Chemical-physical parameters of Egyptian Jasmine and Giza177 rice varieties bran oil were characterized. The free fatty acid, peroxide value, Saponification number and iodine value were recorded as 3.1% (as Oleic acid), 4.55 (meq O2/kg oil), 185.1 (mg KOH/g oil) and 92.64 (g I2/100 g oil), respectively. γ -oryzanol is an important component in rice bran oil, it occurs in Egyptian Jasmine rice bran oil at a high level up to 1.8%, where it serves as a natural antioxidant. Data also showed that Egyptian Jasmine rice bran oilhad higher RSA and oxidative stability 59.23% and 22.86 h, respectively than Giza177 rice bran oil. The fatty acid profile of Giza177 rice bran oil showed palmitic acid (20.02%), stearic acid (1.95%), oleic acid (45.99%), linoleic acid (28.07%) and linolenic acid (1.40%) as major fatty acids. Results revealed that Egyptian Jasmine rice bran oil had higher oleic acid content and lower linoleic acid content than Giza177 rice bran oil. Percentage of hull constituents of Egyptian Jasmine was markedly higher than in hull of Giza 177. Moreover, the same trend was observed with total phenol content (TCP) and 2, 2-diphenyl-1-picrylhydrazyl (DPPH). Generally, the increase of total phenolic content led to an increase in DPPH %, this result led to an increase of anti-oxidant activity in rice hulls. | ||||
| Keywords | ||||
| Egyptian Jasmine; growth performance; Rice bran oil; Antioxidant; Radical Scavenging Activity (RSA); Oxidative stability; Fatty acid composition; GC-MS; 5-Methylfurfural; 2-Ethylphenol; Eugenol and TPC | ||||
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